* Flame tests are used to identify metal ions. The color of the flame is caused by the excitation of electrons in the metal ions.
* Sodium sulfate (Na₂SO₄) contains sodium ions (Na⁺). Sodium ions are known to produce a bright yellow flame.
* However, the sulfate ion (SO₄²⁻) doesn't contribute to the flame color. It's a non-metal anion.
In summary, if you were to perform a flame test on sodium sulfate, you would observe a bright yellow flame due to the presence of sodium ions.
